Because it is a one gear bike, it is a fundamental factor to have the right one. For instance, if the gear has a lot of resistance, then definitely you will have to stop at every steep landscape. On the other hand, if the bike has a little gear, you will have to constantly be spinning the legs to get yourself on the motion. Since the ration between the rear and front chaining is used to determine the gear, commuters will find it ideal if they are using a gear of about 65 - 7 inches. As for track cycles, they probably need a gear with bigger inches. Actually, the gear inches increase with the wideness of the tire. 10oxen